its a very neat setup , ever seen the guts on one? pretty unique system really , just ugly as sin to me . But then again its just another black gun for that kind of money I would be looking at a SBR chambered in 9mm or 45 . next on my list is going to be a 30 caliber AR of some sort not sure if it will be a .300 blk or a .308 but I just did send in more form 4s for another SBR lower just not exactly sure what I have intended for it yet